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Abstract

Novel segmented polysulfide-polyfluoroether copolymers are disclosed. In particular, a polyurethane segmented copolymer composition is provided, comprising one or more polyurethane/urea hard segments, one or more polysulfide soft segments, one or more polyfluoroether soft segments, isocyanate species or derivatives thereof contained in each of the segments, and one or more curatives. The polysulfide soft segments and the polyfluoroether soft segments are together about 50 wt % to about 95 wt % of the copolymer. The weight ratio of the polysulfide soft segments to the polyfluoroether soft segments is from about 0.1 to about 10. The polyfluoroether soft segments are characterized by a glass-transition temperature of about −85° C. or lower. These copolymers are useful in elastomers for improved fluid resistance, substrate adhesion, and low-temperature flexibility. These properties are desirable for sealants and other applications.

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First Claim